Friction counterpoised windlass-drum.



T. H. SOHLIEN 0. A. KNUDTSON. FRICTION COUNTERPOSED WINDLASS DRUM.

APPLlCATlON FILED MAY 1917- Patented Apr. 22, 1919.

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TIIEQDQRE H. SOBLIEN .AND OLE A. KNUDTSON, OF MINNEAPOLIS, MINNESOTA.

FRICTION COUNTERPISED WIN DLASS-DRUM.

Speccation of Letters Patent.

`Patented Apr. 22, 1919.

Application led May 7, 1917. Serial No. 166,814.

To all whom t may concern Be it known that we, TiInoDoRE l-lSoRLmN and VOLE A. KNUDTsoN, citizens of the United States, residing at Minneapolis, inthe county ofHennepin and State of Minnesota, have inventedV certain new and useful Improvements' in Friction Counterpoised fl/Vindlass- Drums; and we do hereby declare the -following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it apper tains to make and use the. same.

ur invention has a-friction counter-poised windlass drumV intendedifor-general use, but especially adapt# ed for use in connection with ceiling beds ofthe type disclosed in United States Letters `Patent No. 1,065,740, ofiJune 24,1913 and issued to Theodore H.' `Sorlien, one of the inventors of the present application.

To the above end, generally'stated, theinvention consists of the novel devices and combinations of devices hereinafter describedVV and defined in the claims.

In the accompanying drawings,v which illustrate the invention, like characters indi-` catelike parts throughout the several views.

" 'eferring to the drawings:

Figure 1 is a vertical section taken through a portion of a room anda ceiling bed arranged to be raised and lowered by means of the friction counter-poised windlass drum, some parts being shown in different positions by means of broken lines, and some parts being diagrammatically illustrated by the same means;

F ig.V 2 is a side elevation of the windlass drum, 4some parts being broken away and some ofthe exposed parts being shown in section; and p is a horizontal section taken on the une 3-3 of Fig. e.Y

-Forthe purpose of showing the invention in-working position,.there is illustrated in the drawings a portion ofa room having in its' 'ceiling an opening arranged to receive and hold, when not in uSe, a ceiling bed w'hichijsy raised and lowered by means of the friction counter-poised windlass drum.

Of'the parts oftheroom shown, the nue meralsel, 5, and 6 indicate, lrespectively, the floor, uprights in one of the partitions, and

for its object to provide ceiling having an opening? to receive the bed8. Extendinginto the opening 7 is a rectangular supportinglange 9 Vformed by securing a molding to the ceiling' 6. When the bed 8 is lowered, the opening 7 isclosed by a panel 10 displaceably supported in said opening on the flange 9. In raising the bed 8, the panel 10 is lifted thereby, as indicated by broken lines in Fig. 1, and the opening closed after the bed 8 enters theren by al panel 1l carried by and below said Referring' now in detail to the invention, the numeral 12 indicates a horizontally disposed rectangular frame of such length and width as to snugly lit between two of the uprights 5 and not interfere with the walls of the partition. The ends extend both above and below the sides there` of to give additional bearing surfaces and are'rigidly secured by lag screws 13 to the respective uprights 5.

Within the frame 12 is a vertically disposed windlass drum 14 keyed to a short shaft 15 journaled in bearings 16 formed in the sides of said frame. The rim 17 lof the windlass drum has integrally formed with itsinner edge portion, an external gear 18; Formed in the periphery of the rim 17 is a spiral lgroove 19 the convolutions of which extend from the gear 18 to the outer edge portionof said rim. The rim 17 and the hub :9.0 of the windlass drum are, as shown, integral `with a connecting web 21 which has formed therein a plurality of circumferentially spaced annular openings' 22 for the sake of lightness. It will vbe noted that the hub 2'() extends entirely inward from the web 2l and on thel outer face of said web, is an axially located annular flange afording a large hub 23, the purpose of which will presently appear.

eshing with the., gear 18 is a pinion 2l keyed to a shaft 25 journaled in bearings 26 formed by extending the sides of the frame 12 downward onto the left hand end of said frame. The outer end of the shaft 25 is extended through the frame 12, and formed angular to receive a crank, not shown, by which the pinion 24, and hence the windlass drum 14 may be rotated.v the wall will. be provided with a doorof the frame l2V equipped opening to afford access to the windlass drum.

Four laterally spaced cables, preferably wire, are laid in the groove 19, as best shown in Fig. 3, and their immediate ends are secured to the windlass drum 14 by inserting the same through holes 28 formed in the rim 17, and then enlarged in any suitable way, so that they cannot pull therethrough. From the windlass drum 14, the cables 27 extend vertically upward between the respective uprights 5, over guide sheaves 29, and thence, horizontally over guide sheaves 30 located one over each corner of the bed 8. The cables 27 from the guide sheaves 30, extend vertically downward through apertures in the panel 10, and are secured one to each corner of the bed 8." The guide sheaves 29 and 30 are secured to the ceiling structure 6 above the opening 7.

From the above description, it is evident that under the rotation of the windlass drum 14, the cables 27 will be wound thereon or unwound therefrom, depending` on which way said windless drum is rotated. Vhen the bed 8 is lowered, the same is supported directly on the floor 4 by folding legs with which said bed is provided. These legs, when the bed is raised, are folded in positions above the panel 11.

The bed 8 and the load carried thereby are sustained by a friction device in different elevated positions while said bed is being either raised or lowered, or while the same is stored in the opening 7. This friction device comprises inner and outer friction disks 31 and 32 respectively, and facings 33 interposed between said two disks, and between the inner disk 31 and the head 14 of the windless drum. The friction disk 31 is journaled on the hub 23 and has formed on its outer face an axially located annular ratchet 34in the form of circumferentially spaced segmental notches. Coperating with the ratchet 34 is a pawl 35 in the form of a ball mounted in a pocket 36 formed in a block 37 detachably secured by screws 38 to the inner face of the outer side member of the frame 12. This ocket 36 is pro-vided with an inclined sur ace 39 which directs the pawl 35 into interlocking engagement with the ratchet 34. The pawl 35 and ratchet 34 are arranged to lock the friction disk 31 against rotation when the bed 8 is lowered, and to release the same when the bed is raised to permit said friction disk 31 to rotate with the windless drum 14.

The friction disk 32 is mounted directly on the shaft 15 outward of the hub 23 with freedom for axial movement thereon, but is held for rotation with the windless drum 14 by a plurality, as shown three, circumferentially spaced bolts 40, which extend through alined apertures in the friction disk 32 and the web 21. The heads of the bolts 40 are countersunk in the outer face of the friction disk 32, and their ends have screwthreaded engagement with a spider bracket 41 through which the hub 20 projects. Coiled springs 42 encircling the bolts 40 are compressed between the web 21 and bracket 41 and yieldingly hold the friction disk 32 under strain to move axially on the shaft 15 toward the friction disk 31.

The facings 33 may be made from ber or other suitable material and, as shown, there are three members in each set, and which members are circumferentially spaced in respect to each other. One set of the facings 33 are rigidly secured by rivets to the outer face of the web 21 and bears against the inner face 0f the friction disk 31, and the other set thereof are rigidly secured by rivets to the outer face of the friction disk 31 and bears against the inner face of the friction disk 32. It is important tonote that the friction disk 31 is considerably larger in diameter than the friction disk 32, and that the facings 33 are located for action upon the friction disks 31 and 32, just inward of their peripheries. By making the friction disks 31 and 32 of different diameters, and locating the facings close to the peripheries thereof, brings said facings into position for action on concentric surfaces of the friction device, and thereby tends to war the members thereof and increase the e 'ciency of the friction device. The frictional contact of the facings 33 with the disks 31 and 32 willcause the friction disk 31 to rotate with the windlass drum 14, while the bed 8 is being raised. The tension of the springs 42 acting on the friction disks 31 and 32 is more than sufficient to sustain the load on the cables 27 and makes it positively necessary to turn the windlass drum 14 by the crank, herebefore referred to, to unwind the cables 27 from the windlass drum 14, and lower the bed 8. By adjustingthe bolts 40, the tension of the springs 42 may be varied, at will. y

What we claim iscv 1. The combination with a load to be raised, of a drum, means supporting the load from the drum, a revoluble friction plate, means for limiting the rotation of the friction plate to one direction, a friction coupling set under constantly applied frictional engagement with the drum and friction plate, said coupling also being set under such friction that i-t will not slip under the load but adapted to slip under a certain force in addition to the load and means for positively rotating the drum in either' direction.

2. rThe combination with a load to` Vloe raised, of a drum, means supporting the load from the drum, a revoluble friction plate, means for limiting the-rotation of the friction plate to one direction, an adjustable friction coupling set under constantly applied frietional engagement with the drum and In testimony whereof we affix our signafrietonal plate, said coupling also being set tures in presence of two witnesses. under such friction that it will not slip under THEUDORE H. SGRLIEN. the load but adapted to slip under a, certain OLE A. KNUDTSON. 5 force in addition to the loa-d and means foll Witnesses:

positively rotating the drum in either di- MAY A. SMITH, reetion.

HARRY D. KJLGORE.

Copies of thispatent may be obtained for ve cents each, by

addressing the "Commissioner of Patents, Washington, D. G. 

